21112032173 has 2 divisors, whose sum is σ = 21112032174. Its totient is φ = 21112032172.

The previous prime is 21112032089. The next prime is 21112032211. The reversal of 21112032173 is 37123021112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20169112324 + 942919849 = 142018^2 + 30707^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112032173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112031173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556016086 + 10556016087.

It is an arithmetic number, because the mean of its divisors is an integer number (10556016087).

Almost surely, 2^21112032173 is an apocalyptic number.

It is an amenable number.

21112032173 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112032173 is an equidigital number, since it uses as much as digits as its factorization.

21112032173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

Adding to 21112032173 its reverse (37123021112), we get a palindrome (58235053285).

The spelling of 21112032173 in words is "twenty-one billion, one hundred twelve million, thirty-two thousand, one hundred seventy-three".